dogpile

noun

1. (US, colloquial)A disorderly pile of people formed by jumping upon a victim.

   “The bottom man of a 'dog pile' in a fraternity house scuffle is in a hospital with a neck dislocation.”

2. (US, colloquial, figuratively)Any similarly disorderly pile of people or things.

   “Purdy tucked the pigskin under his elbow and cantered over a dog-pile for a tally.”

   “Unscrambling the dogpile of objects can be messy.”

3. (US, colloquial, euphemistic)A pile of dog excrement.

   “Mrs. Brown cleaned her lawn up bright and early each day; Picked up all the dog piles so her children could play.”

4. (Internet)The situation where many participants attack the same user (on a discussion forum or similar).
5. A cache stampede.

verb

1. (US, ambitransitive, colloquial, often)To jump into a dogpile.

   “He can either take a beating from one man or... be dogpiled by a dozen men.”

   “I fumbled the snap, fell on the ball and about 10 guys dog-piled on top of me.”

   “A vampire got her around the neck from behind; then more, dogpiling her.”

   “That story — about Carlson’s conflicted response to the sight of “a group of Trump guys” dogpiling an “Antifa kid” — appears to involve a crisis of conscience, an unexpected, chastening eruption of empathy.”

2. (US, ambitransitive, colloquial, figuratively)To pile on, to overwhelm in other senses.
3. (Internet)For many participants to attack the same user (on a discussion forum or similar).

   “But this guy was serious, using online payment services and dogpiling her e-mail box within minutes, requesting expedited shipping.”